Cannula needle; complex for the insertion of a flexible catheter stiffened with a metal needle. Retractable metal needle

摘要

This invention offers guarantees of safety and easy and rapid handling together with very low costs. It is presented in two alternatives, but in both cases the principle that the needle is withdrawn from sight, into the protective tube and, until the entire feed device is removed, is retained. The first arrangement has a transparent protective bellows tube which elongates when subjected to a pull, causing the metal needle which is fixed to the end of the tube connected to the bottle to disappear within it. The second arrangement has a flexible tube of suitable transparent plastics material into which the tube connected to the bottle containing the feed liquid slides without breaking the seal. The needle fixed to the end of the said tube is drawn out of site within the protective tube. IMAGE